code: def __init__(self, graph):
      self.graph = graph
      self.tokens = Token.tokens
      self.parser = yacc.yacc(module=self, start="rf_net", debug=False)
      self.layer_num = 0
  
file_path: nnabla/python/src/nnabla/utils/converter/nnabla/opt_parser.py
imports: from ply import yacc
  from .opt_graph import Token
label_desc: Use image node_id 1 to create a new OptimizerParser object  with example: obj = OptimizerParser(graph)